Research Opportunities for Materials with Ultrafine Microstructures (1989) / Chapter Skim
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Pages 46-48
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From page 46... ...
The tendency for ternary phases to form alternating layers with binary phases was also observed in the Ti-Ge-C system. MACROMOLECULAR COMPOSITE STRUCTURES A molecular composite is a polymeric material consisting of two or more components dispersed at the molecular level.
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From page 47... ...
2 Phase Liquid Phase Liquid ~ ~ Decomposition or / 17 <~ \ Crosslinking / ~ ~+ ~ t at; __ ~ \ I ~ 1 Phase Glass 0 1 A Volume Fraction of Polymer B B Blended with Polymer A Processing Window T gB FIGURE 12 Schematic phase diagram for polymer blends (Karasz, 1986 ~ . While compatible polymer alloys are of interest, the focus here is on the area of self-reinforcing alloys, the so-called molecular composites.
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From page 48... ...
The advantage here is that the built-in chemical connections between the dissimilar segments significantly raise the critical concentration at which phase separation takes place; moreover, the scale of this phase separation is dictated to be on the order of the respective block radii of gyration, thus preventing macroscale segregation and loss of physical properties. The mechanical properties of the considerably more easily processed PBZT/ABPBI block copolymer fiber are comparable to those of the physical blend.
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